/Engine/Plugins/Runtime/Metasound/Source/MetasoundGenerator/Public/MetasoundGenerator.h
Called when a new graph has been "compiled" and set up as this generator's graph. Note: We don't allow direct assignment to the FOnSetGraph delegate because we want to give the Delegate an initial immediate callback if the generator already has a graph.
[FDelegateHandle](API\Runtime\Core\Delegates\FDelegateHandle) AddGraphSetCallback ( FOnSetGraph::FDelegate && Delegate )